<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <h2><%= book._id?'更新':'添加' %> 图书</h2>
    <form action="/book/<%= book._id? 'update':'add'%> " method="post">
        <!-- 只有更新才产生隐含表单项 -->
        <% 
            if(book._id){
        %>
        <input type="hidden" name="_id" value="<%= book._id%>">
        <%
            }
        %>
        书名:<input type="text" name="name" value="<%=book.name%>">
        <br>
        作者:<input type="text" name="author" value="<%=book.author%>">
        <br>
        价格:<input type="number" name="price" value="<%=book.price%>">
        <br>
        <input type="submit" value="提交">
    </form>
</body>

</html>